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Finding the Fourth Proportional to 675.28, 1,011.84 and 386.56

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Solution

The fourth proportional to 675.28, 1,011.84 and 386.56 is: 579.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.28 : 1,011.84 = 386.56 : x
  2. Step 2: Convert to fraction form
    675.28/1,011.84 = 386.56/x
  3. Step 3: Cross multiply
    675.28x = 1,011.84 × 386.56
  4. Step 4: Simplify right side
    675.28x = 391,136.87
  5. Step 5: Solve for x
    x = 391,136.87/675.28
  6. Step 6: Final answer
    x = 579.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.